@article{MengThomsonKlugetal.2019,
  author    = {Fanqi Meng and Mark David Thomson and Bernhard Klug and Dovilė Čibiraitė and Qamar Ul-Islam and Hartmut Roskos},
  title     = {Nonlocal collective ultrastrong interaction of plasmonic metamaterials and photons in a terahertz photonic crystal cavity},
  journal   = {Optics express},
  volume    = {27},
  number    = {17},
  pages     = {24455 -- 24468},
  doi       = {10.1364/OE.27.024455},
  year      = {2019},
}